Faceting Design Diagram: Cap – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


Quartz (Amethyst, Citrine, Ametrine, Smokey, Rose)

Cap (B20.JRG)
By Jeff R. Graham
Copyright 2001
87.9% Light Return
Angles for R.I. = 1.54
67 facets + 16 facets on girdle = 83
2-fold, mirror-image symmetry
96 index
L/W = 1.342 T/W = 0.827 T/L = 0.616
P/W = 0.583 C/W = 0.202
H/W = (P+C)/W+0.02 = 0.806
P/H = 0.724 C/H = 0.251
Vol./W^3 = 0.439

Addition # 5 – Cut in R.I 1.54 to 1.76 (89.1%). This is harder to cut than it looks, be sure your L/W is correct. The table meets can be tough. This is designed for large Quartz, but works well in light man-made materials.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.